If you want to set an expiration date and password when sharing Excel files online, here is how you can do that. It is possible to do both of them when using Excel Online.

There are several options available to you to protect your Excel file with a password. Remember that once you protect the Excel file, you cannot open it without entering the password.

14. To make all cells editable again, click on "Unprotect Sheet" — which is in the "Protect" tab under "Review" — and re-enter your password. The cells will now be unlocked.